Great ambient, very nice composition, GL!

I think you should check your shadows. The light from the window in particular.

No difference in the high res.There are shadows cast by the Muntins in the window. These are not showing on your text model.

You know, I love a good steampunk anything - but by using an external image for your light source instead of the lighting abilities of a 3D program, you have negated the correctness of the shadows. Even close to the edge, some of the shadows SHOULD be falling across the letters. AND, you can see this all the better in hi-res. As much trouble as I have had learning shadows, even I can tell that this is way off.

Really nice work...But the surrounding picture & the text lightening is not matching at all.

I love how you made the letters, with the cutouts in the side and the gears in there, however, IMHO, the gears should be brass, or in this case, old tarnished brass, not silver (look up brass goggles, steampunk, etc.). Also, the 'steam' coming out of the pipe looks too heavy for real steam, try lightening it a bit, and maybe lenghening it also.

Author you still have time, may I suggest that you create your own window to mimic the one in the image - and to take its place - and then put the light through that one - let the program make it right. There are still incorrect shadows right under the letters, and none crossing over them.There's one spot where it's very obvious they should be crossing over.
This has real potential with some tweaks.

http://www.pxleyes.com/forum/viewtopic.php?f=4&t=3702&p=46683#p46683